The product is a 3-pack of black ink SPR4 ballpoint refills designed for tactical and bullet Fisher Space Pens. Made in the USA from metal, these medium-point pens are compatible with Fisher Space Pens such as the Bullet and Shuttle. The black ink provides a sleek and sophisticated writing experience, making it a practical and reliable choice for pen enthusiasts and collectors alike. The brand, Fisher, is known for its quality and craftsmanship, ensuring a high performance and consistent writing experience with each refill.